include/linux/pm_runtime.h

   1 /*
   2  * pm_runtime.h - Device run-time power management helper functions.
   3  *
   4  * Copyright (C) 2009 Rafael J. Wysocki <rjw@sisk.pl>
   5  *
   6  * This file is released under the GPLv2.
   7  */
   8
   9 #ifndef _LINUX_PM_RUNTIME_H
  10 #define _LINUX_PM_RUNTIME_H
  11
  12 #include <linux/device.h>
  13 #include <linux/pm.h>
  14
  15 #include <linux/jiffies.h>
  16
  17 /* Runtime PM flag argument bits */
  18 #define RPM_ASYNC               0x01    /* Request is asynchronous */
  19 #define RPM_NOWAIT              0x02    /* Don't wait for concurrent
  20                                             state change */
  21 #define RPM_GET_PUT             0x04    /* Increment/decrement the
  22                                             usage_count */
  23 #define RPM_AUTO                0x08    /* Use autosuspend_delay */
  24
  25 #ifdef CONFIG_PM_RUNTIME
  26
  27 extern struct workqueue_struct *pm_wq;
  28
  29 extern int __pm_runtime_idle(struct device *dev, int rpmflags);
  30 extern int __pm_runtime_suspend(struct device *dev, int rpmflags);
  31 extern int __pm_runtime_resume(struct device *dev, int rpmflags);
  32 extern int pm_schedule_suspend(struct device *dev, unsigned int delay);
  33 extern int __pm_runtime_set_status(struct device *dev, unsigned int status);
  34 extern int pm_runtime_barrier(struct device *dev);
  35 extern void pm_runtime_enable(struct device *dev);
  36 extern void __pm_runtime_disable(struct device *dev, bool check_resume);
  37 extern void pm_runtime_allow(struct device *dev);
  38 extern void pm_runtime_forbid(struct device *dev);
  39 extern int pm_generic_runtime_idle(struct device *dev);
  40 extern int pm_generic_runtime_suspend(struct device *dev);
  41 extern int pm_generic_runtime_resume(struct device *dev);
  42 extern void pm_runtime_no_callbacks(struct device *dev);
  43 extern void pm_runtime_irq_safe(struct device *dev);
  44 extern void __pm_runtime_use_autosuspend(struct device *dev, bool use);
  45 extern void pm_runtime_set_autosuspend_delay(struct device *dev, int delay);
  46 extern unsigned long pm_runtime_autosuspend_expiration(struct device *dev);
  47
  48 static inline bool pm_children_suspended(struct device *dev)
  49 {
  50         return dev->power.ignore_children
  51                 || !atomic_read(&dev->power.child_count);
  52 }
  53
  54 static inline void pm_suspend_ignore_children(struct device *dev, bool enable)
  55 {
  56         dev->power.ignore_children = enable;
  57 }
  58
  59 static inline void pm_runtime_get_noresume(struct device *dev)
  60 {
  61         atomic_inc(&dev->power.usage_count);
  62 }
  63
  64 static inline void pm_runtime_put_noidle(struct device *dev)
  65 {
  66         atomic_add_unless(&dev->power.usage_count, -1, 0);
  67 }
  68
  69 static inline bool device_run_wake(struct device *dev)
  70 {
  71         return dev->power.run_wake;
  72 }
  73
  74 static inline void device_set_run_wake(struct device *dev, bool enable)
  75 {
  76         dev->power.run_wake = enable;
  77 }
  78
  79 static inline bool pm_runtime_suspended(struct device *dev)
  80 {
  81         return dev->power.runtime_status == RPM_SUSPENDED
  82                 && !dev->power.disable_depth;
  83 }
  84
  85 static inline bool pm_runtime_enabled(struct device *dev)
  86 {
  87         return !dev->power.disable_depth;
  88 }
  89
  90 static inline bool pm_runtime_callbacks_present(struct device *dev)
  91 {
  92         return !dev->power.no_callbacks;
  93 }
  94
  95 static inline void pm_runtime_mark_last_busy(struct device *dev)
  96 {
  97         ACCESS_ONCE(dev->power.last_busy) = jiffies;
  98 }
  99
 100 #else /* !CONFIG_PM_RUNTIME */
 101
 102 static inline int __pm_runtime_idle(struct device *dev, int rpmflags)
 103 {
 104         return -ENOSYS;
 105 }
 106 static inline int __pm_runtime_suspend(struct device *dev, int rpmflags)
 107 {
 108         return -ENOSYS;
 109 }
 110 static inline int __pm_runtime_resume(struct device *dev, int rpmflags)
 111 {
 112         return 1;
 113 }
 114 static inline int pm_schedule_suspend(struct device *dev, unsigned int delay)
 115 {
 116         return -ENOSYS;
 117 }
 118 static inline int __pm_runtime_set_status(struct device *dev,
 119                                             unsigned int status) { return 0; }
 120 static inline int pm_runtime_barrier(struct device *dev) { return 0; }
 121 static inline void pm_runtime_enable(struct device *dev) {}
 122 static inline void __pm_runtime_disable(struct device *dev, bool c) {}
 123 static inline void pm_runtime_allow(struct device *dev) {}
 124 static inline void pm_runtime_forbid(struct device *dev) {}
 125
 126 static inline bool pm_children_suspended(struct device *dev) { return false; }
 127 static inline void pm_suspend_ignore_children(struct device *dev, bool en) {}
 128 static inline void pm_runtime_get_noresume(struct device *dev) {}
 129 static inline void pm_runtime_put_noidle(struct device *dev) {}
 130 static inline bool device_run_wake(struct device *dev) { return false; }
 131 static inline void device_set_run_wake(struct device *dev, bool enable) {}
 132 static inline bool pm_runtime_suspended(struct device *dev) { return false; }
 133 static inline bool pm_runtime_enabled(struct device *dev) { return false; }
 134
 135 static inline int pm_generic_runtime_idle(struct device *dev) { return 0; }
 136 static inline int pm_generic_runtime_suspend(struct device *dev) { return 0; }
 137 static inline int pm_generic_runtime_resume(struct device *dev) { return 0; }
 138 static inline void pm_runtime_no_callbacks(struct device *dev) {}
 139 static inline void pm_runtime_irq_safe(struct device *dev) {}
 140
 141 static inline bool pm_runtime_callbacks_present(struct device *dev) { return false; }
 142 static inline void pm_runtime_mark_last_busy(struct device *dev) {}
 143 static inline void __pm_runtime_use_autosuspend(struct device *dev,
 144                                                 bool use) {}
 145 static inline void pm_runtime_set_autosuspend_delay(struct device *dev,
 146                                                 int delay) {}
 147 static inline unsigned long pm_runtime_autosuspend_expiration(
 148                                 struct device *dev) { return 0; }
 149
 150 #endif /* !CONFIG_PM_RUNTIME */
 151
 152 static inline int pm_runtime_idle(struct device *dev)
 153 {
 154         return __pm_runtime_idle(dev, 0);
 155 }
 156
 157 static inline int pm_runtime_suspend(struct device *dev)
 158 {
 159         return __pm_runtime_suspend(dev, 0);
 160 }
 161
 162 static inline int pm_runtime_autosuspend(struct device *dev)
 163 {
 164         return __pm_runtime_suspend(dev, RPM_AUTO);
 165 }
 166
 167 static inline int pm_runtime_resume(struct device *dev)
 168 {
 169         return __pm_runtime_resume(dev, 0);
 170 }
 171
 172 static inline int pm_request_idle(struct device *dev)
 173 {
 174         return __pm_runtime_idle(dev, RPM_ASYNC);
 175 }
 176
 177 static inline int pm_request_resume(struct device *dev)
 178 {
 179         return __pm_runtime_resume(dev, RPM_ASYNC);
 180 }
 181
 182 static inline int pm_request_autosuspend(struct device *dev)
 183 {
 184         return __pm_runtime_suspend(dev, RPM_ASYNC | RPM_AUTO);
 185 }
 186
 187 static inline int pm_runtime_get(struct device *dev)
 188 {
 189         return __pm_runtime_resume(dev, RPM_GET_PUT | RPM_ASYNC);
 190 }
 191
 192 static inline int pm_runtime_get_sync(struct device *dev)
 193 {
 194         return __pm_runtime_resume(dev, RPM_GET_PUT);
 195 }
 196
 197 static inline int pm_runtime_put(struct device *dev)
 198 {
 199         return __pm_runtime_idle(dev, RPM_GET_PUT | RPM_ASYNC);
 200 }
 201
 202 static inline int pm_runtime_put_autosuspend(struct device *dev)
 203 {
 204         return __pm_runtime_suspend(dev,
 205             RPM_GET_PUT | RPM_ASYNC | RPM_AUTO);
 206 }
 207
 208 static inline int pm_runtime_put_sync(struct device *dev)
 209 {
 210         return __pm_runtime_idle(dev, RPM_GET_PUT);
 211 }
 212
 213 static inline int pm_runtime_put_sync_suspend(struct device *dev)
 214 {
 215         return __pm_runtime_suspend(dev, RPM_GET_PUT);
 216 }
 217
 218 static inline int pm_runtime_put_sync_autosuspend(struct device *dev)
 219 {
 220         return __pm_runtime_suspend(dev, RPM_GET_PUT | RPM_AUTO);
 221 }
 222
 223 static inline int pm_runtime_set_active(struct device *dev)
 224 {
 225         return __pm_runtime_set_status(dev, RPM_ACTIVE);
 226 }
 227
 228 static inline void pm_runtime_set_suspended(struct device *dev)
 229 {
 230         __pm_runtime_set_status(dev, RPM_SUSPENDED);
 231 }
 232
 233 static inline void pm_runtime_disable(struct device *dev)
 234 {
 235         __pm_runtime_disable(dev, true);
 236 }
 237
 238 static inline void pm_runtime_use_autosuspend(struct device *dev)
 239 {
 240         __pm_runtime_use_autosuspend(dev, true);
 241 }
 242
 243 static inline void pm_runtime_dont_use_autosuspend(struct device *dev)
 244 {
 245         __pm_runtime_use_autosuspend(dev, false);
 246 }
 247
 248 #endif